Sound reproducing device



Oct. 25, 1932. F. H. OWENS SOUND REPRODUCING DEVICE Filed May 22, 1930IN V EN TOR. 59E EMA/v OWE/VS.

AT RNEY Patented Oct. 25, 1932 UNITED STATES FREEMAN H. OWENS, OF NEWYORK, N.

Y., assrenon ro ownns DEVELOPMENT CORPORATION, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK SOUND REPRODUCING DEVICE Application filed May22, 1930. Serial No. 454,768.

This invention relates to improvements in sound recording devices, theprincipal object of the invention being to provide a device of thischaracter by means of which a composite reproduced sound is producedhaving a wider range of frequency than was possible heretofore.

Other objects and advantages of the invention will appear as thedescription proceeds.

In the drawing accompanying this specification,

Figure 1 is a partly diagrammatic front View of a device embodying thefeatures of the present invention.

Figure 2 is an end elevation thereof.

Figure 3 is a broken away side view of a loud speaker illustrating theconnection of said speaker with the associated diaphragm forming afeature of the invention.

Referring to the drawing, 1 designates a pair of uprights or standardswhich are connected together at their upper ends by a cross member 2.The standards are further connected by an inclined member 8 secured atone end to one of said standards adjacent the lower end thereof, and atits opposite end to the other standard approximately midway of itsheight. The members 1, 2 and 3 thus form between them a frame which isof considerably greater depth at one end than at the other. The crossmembers 2 and 3 support between them a plurality of diaphragm members 4spaced apart from each other and each of a length different from itscompanions. These diaphragms of different effective areas as describedare made of some suitable sound responsive medium, such for instance aspaper, glass, wood, metal, membrane, parchment or any other suitablematerial.

Mounted on each of the standards 1 is a bracket 5, on which is supportedat its opposite ends a shelf 6, said shelf extending across the entirelength of the frame in front of the diaphragm members 1. Supported onsaid shelf are a plurality of loud speakers 7, one disposed in front ofeach of said diaphragm members, which speakers may be connected eitherin serie or parallel with any suitable amplifier (not shown) from whichelectrically translated sound impulses emanate. The speakers may also beconnected by wires 8 with a battery 9 or other source of current supplyfor exciting the fields of the speakers, the Circuit; including a switch10.

As shown in Figm'e 3, each of the loud speakers is provided with a voicecoil 11 se cured to a diaphragm 12, which diaphragm in turn is connectedby a rod or pin 13 with the particular diaphragm 4: with which the loudspeaker is associated.

From the foregoing it will be seen that I have provided an assembly ofloud speakers each operatively connected with a diaphragm sounding boardof a length different from that of all of its companions so that theacoustic responses of said diaphragms to the vibrations of thediaphragms 12 of the loud speakers will differ in proportion to thelength of the diaphragms 4;. The assembly will thus produce a compositereproduced sound of a wider range of frequencies than would be possibleby the use of diaphragms of equal length.

I claim:

1. A sound reproducing device, comprising in combination, a frame havinga horizontally disposed member and a member inclined to said horizontalmember, a plurality of diaphragms of differentlengths supported betweensaid members in spaced relation to each other, and a plurality of loudspeakers supported on said frame and each operatively connected withoneof said diaphragms.

2. A sound reproducing device comprising, in combination, a frame havinga horizontally disposed member and a member inclined to said horizontalmember, a plurality of substantially uniform loud speakers havingsubstantially uniform diaphragms supported on said frame, and aplurality of sound responsive diaphragms of different lengths supportedbetween the horizontal member and the inclined member and individuallyand operatively connected to the dia phragms of said loud speakers.

3. A sound reproducing device comprising in combination a supportingframe, a pluiii supported on said frame and individually and operativelyconnected to the diaphragms of said loud speakers.

In testimony whereof, I aflix my signature.

FREEMAN H. OWENS.

